Zinovik E. Synthesis, reduction and crystal chemistry of spinel oxides in the M-Mn-Fe-O, M-Cu-Fe-O systens and a method of prognosing their properties

Тhе object - oxides with spinel structure. The aim - to find synthesis conditions, crystallochemical features, peculiarities of spinel reduction reactions running in M-Mn-Fe-O, Mn-Cu-Fe-O systems and develop rational method of predicting spinel oxides properties. The methods: chemical analysis, X-ray diffraction, microstructural. Spinel solid solutions were synthesized and lattice parameter dependencies on composition were determined. Curie point and magnetic moment from the solution that match calculated using the developed method. The enthalpy of the unstable oxide Co2O3 was defined for the first time. The concentration intervals solutions with tetragonal lattice were specified, correlation between their size and the free energy of transfer M from tetra- into octahedral spinel lattice sites established. The steps of reduction of CuXMn1-XFe2O4 did solutions were specified.